Journal

It is amazing to note that Darwin did not write The Origin of Species until 1859 even though his notebooks show he had been pretty close to the correct idea at least 15 or 20 years prior. What was he doing in all that time? Well, for eight years at least, he was studying barnacles.

 

via: https://www.farnamstreetblog.com/2016/01/charles-darwin-thinker/